Robert Halfon, the Conservative and one of the main supporters of the common market 2.0, says common market 2.0 would be a workers’ Brexit. It would safeguard workers’ rights. It would also avoid the need for the backstop, because it could be implemented before the end of the transition period. And it is a unifying Brexit, he says, because it has the support of MPs from across the Commons.

Sammy Wilson, the DUP’s Brexit spokesman, says the DUP will not be voting for any of the amendments on the order paper tonight. They do not safeguard the union, he claims, and they do not deliver Brexit.

On the PM programme earlier Nadhim Zahawi, the children’s minister, said that any Brexit proposal that gains a majority in tonight’s vote should be put up against Theresa May’s plan in a head-to-head contest. He said:

I would like the option that parliament comes up with put up against the prime minister’s deal. I am confident that the prime minister’s deal would win the day.

I’m not sure they will agree on anything tonight but if they do and we put it up against the prime minister’s deal, the prime minister’s deal would be infinitely better.

At the Number 10 lobby briefing this morning the prime minister’s spokesman implied that May was seriously considering this option. (See 12.12pm.)

The defence minister Tobias Ellwood told Channel 4 News he thought MPs were coalescing around a customs union. “I think that’s where we are heading towards,” he said. When it was put to him that this would go against the Conservative party manifesto, he said:

When you put your deal through three times and colleagues and others have not supported it, but you still want to honour the referendum result itself, you still want to get out of Europe, then something small has to give.

In his speech a few minutes ago, explaining why Labour was backing the common market 2.0 amendment, Keir Starmer said that amendment had been revised since last week (when Labour was not formally backing it) and that it now had more detail about the form of the customs union envisaged.

He said there were still differences between the amendment and Labour’s position. But it was a “credible proposition”, he said.

As the New Statesman’s Patrick Maguire reports, Jeremy Corbyn has written to Labour MPs about tonight’s votes. Corbyn’s letter makes it clear that Labour is now backing the common market 2.0 plan because it agrees with every aspect of it. He says Labour is still pushing for its Brexit plan, but that it is backing common market 2.0 because aspects of both plans overlap and it wants to “break the deadlock” and find “consensus”.

The Conservative Ed Vaizey is speaking now. He says he will vote for the customs union amendment and the common market 2.0 amendment. He says he is alarmed that some of his colleagues want a no-deal Brexit.

The fact is that too many of our colleagues have decided that they are the self-appointed interpreters of Brexit and that anything that gets in their way must be stopped.

Starmer says Labour will not be backing Cherry’s amendment. Joanna Cherry intervenes to ask what Starmer what Labour’s working-class voters will think if the UK crashed out with a no-deal Brexit because Labour did not back her amendment.